New answers tagged unbricking
Download the firmware suitable for your country and device, flash it with flashtools (simply turn phone off and when you have flashtools ready, connect the USB cable to phone (better try first to let windows install proper driver)) search for vcomm driver if win fails.
I thought I could use my nandroid backup to flash system.img, etc. to overwrite what's there but it's one big .win file. So I looked up the fastboot commands anyways and stumbled on an xda thread about un-bricking TF300s where they used fastboot erase on every mount point then fastboot flashed the stock firmware blob file from Asus' support website. Ran ...
I solved by enabling developer mode and disabling usb debug.
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